Watch 10 video solutions for Check Array Formation Through Concatenation, a easy level problem involving Array, Hash Table. This walkthrough by Fraz has 2,923 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
You are given an array of distinct integers arr and an array of integer arrays pieces, where the integers in pieces are distinct. Your goal is to form arr by concatenating the arrays in pieces in any order. However, you are not allowed to reorder the integers in each array pieces[i].
Return true if it is possible to form the array arr from pieces. Otherwise, return false.
Example 1:
Input: arr = [15,88], pieces = [[88],[15]] Output: true Explanation: Concatenate [15] then [88]
Example 2:
Input: arr = [49,18,16], pieces = [[16,18,49]] Output: false Explanation: Even though the numbers match, we cannot reorder pieces[0].
Example 3:
Input: arr = [91,4,64,78], pieces = [[78],[4,64],[91]] Output: true Explanation: Concatenate [91] then [4,64] then [78]
Constraints:
1 <= pieces.length <= arr.length <= 100sum(pieces[i].length) == arr.length1 <= pieces[i].length <= arr.length1 <= arr[i], pieces[i][j] <= 100arr are distinct.pieces are distinct (i.e., If we flatten pieces in a 1D array, all the integers in this array are distinct).